A 64 y.o. patient has developed of squeering substernal pain which had appeared 2 hours ago and irradiated to the left shoulder, marked weakness. On examination: pale skin, cold sweat. Pulse- 108 bpm, AP- 70/50 mm Hg, heart sound are deaf, vesicular breathing, soft abdomen, painless, varicouse vein on the left shin, ECG: synus rhythm, heart rate is 100 bmp, ST-segment is sharply elevated in II, III aVF leads. What is the most likely disorder?